High Speed Level Shifter
a level shifter, high-speed technology, applied in the direction of pulse automatic control, pulse technique, logic circuit, etc., can solve the problem of delay between input and output signal, and achieve the effect of reducing the delay time and considerably accelerating the charging speed
Active Publication Date: 2008-10-02
INFINEON TECH AG
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Benefits of technology
The present disclosure relates to a level shifter that can adjust the voltage level of an input signal to a higher or lower level. The level shifter includes a current source that can inject a current pulse into the parasitic capacitance of the input stage, which results in a faster charging of the parasitic capacitance and a reduction of delay time. The level shifter can be used in a circuit arrangement that includes a high-side semiconductor switch, a floating driver circuit, and a level shifter. The technical effects of this invention include faster and more efficient signal level shifting and improved circuit performance.
Problems solved by technology
The delay between the input and the output signal caused by the level-shifter is due to the charging and the discharging of parasitic capacitors in the input stage.
Method used
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[0019]FIG. 1 shows the basic implementation of a buck converter comprising a high-side semiconductor switch MHS, a floating driver circuit 20 for controlling the high-side semiconductor switch MHS, a level shifter LS receiving an input signal PWM and providing an output signal PWM′ being a level shifted version of the input signal PWM. The buck converter further comprises a bootstrap supply circuit with a bootstrap capacitor CBTS and a bootstrap diode DBTS and an output circuit comprising an inductor L connected in series with a capacitor C and a free-wheeling diode D connected in parallel to the series circuit of the inductor L and the capacitor C. The output voltage Vout of the buck converter is provided by the capacitor C at node out and received by a regulator 10 which provides as an output signal the input signal PWM for the level shifter.
[0020]The semiconductor switch MHS may be any known semiconductor switch, e.g., a MOSFET, an IGBT, a bipolar transistor, etc. In the case of ...
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The invention relates to a level shifter comprising an input stage having a parasitic capacitance and a first input terminal for applying an input signal, a limiter stage having a second input terminal for applying a switching signal, wherein said input stage is coupled between a first supply terminal and said limiter stage, an output stage being coupled between a second supply terminal and said limiter stage and providing an output signal which is a level shifted version of said input signal, and a current source being adapted for injecting a current pulse into said parasitic capacitance dependent on variations of said switching signal over time.
Description
[0001]This application claims priority to European Patent Application 07 006 436.5, which was filed Mar. 28, 2007 and is incorporated herein by reference.TECHNICAL FIELD[0002]The invention relates to a level-shifter for transferring electric signals related to a first electric potential to electric signals related to a second electric potential.BACKGROUND[0003]Especially in high voltage systems, it is often necessary to transfer information in form of electric signals, from a low side to a high side of an electric circuit, where in the low side of the circuit signals are related to a first electric potential (e.g., ground potential) and in the high side of the circuit signals are related to a second electric potential (e.g., a floating reference potential). One example is a high side semiconductor switch whose switching state is to be controlled by a control signal. The voltage level of the control signal in this case is not related to a fixed potential (further referred to as groun...
Claims
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IPC IPC(8): H03L5/00
CPCH03K3/356113H03K19/018528
Inventor FLAIBANI, MARCOBODANO, EMANUELEGARBOSSA, CRISTIAN
Owner INFINEON TECH AG